Sensibilidade ao clareamento de consultório não aplicado no terço cervical: ensaio clínico randomizado

Abstract

Despite its proven effectiveness, the bleaching can lead to doubt regarding the presence of tooth sensitivity. Therefore, alternatives have been sought to reduce the main limitation of the dentist. The study aimed to compare the absolute risk and intensity of the sensitivity of bleaching with hydrogen peroxide to 35%, following a protocol of non-application of the gel in the cervical area. Thirty-five patients were select for this parallel, double-blind study, split-mouth randomized trial. Randomly, the Barrier Sulcus (BS) group received the light-curable resin gingival barrier to the level of the gingival sulcus, and the Cervical Barrier (CB) group the barrier was extended by about 2mm to include the entire cervical area of the teeth. The 35% hydrogen peroxide was applied three times for 15 minutes, resulting in 45 minutes of each bleaching session. There were 2 sessions with a 1-week interval. Tooth sensitivity was recorded up to 1 hour after each session, between 24 and 48 hours after and 30 days after the second session, using the Numerical Scale (NRS) and Visual Analog Scale (VAS). The color changes was evaluated before the study, in a period of 1 week, 2 weeks and 30 days after the end of the bleaching treatment, with the Vita Clássica scale, Vita Bleach scale and Easyshade spectrophotometer. Color changes of bleaching and intensity of sensitivity of tooth was evaluated by the Wilcoxon-paired test. The absolute risk of tooth sensitivity was compared by the Mc Nemar’s test (α = 0.05). Effective bleaching was observed for both groups after three weeks, without statistical difference. Not detected difference in terms of risk of tooth sensitivity and intensity of tooth sensitivity was detected between groups. Approximately, 86% of the participants experienced tooth sensitivity, which was recorded mainly as ‘‘mild.’’ The non-application of the gel with hydrogen peroxide to 35% does not seem to affect the degree of bleaching and tooth sensitivity.